光阑对非均匀偏振光传输特性的影响

Effect of the aperture on propagation characteristics of nonuniformly polarized beams

从光束的相干 偏振 (BCP)矩阵和传输理论出发 ,推导出了非均匀偏振 (NUP)光通过光阑后的偏振度和光强分布的一般表示式。给出了一个光强均匀分布NUP光束的数值计算例。结果表明 ,通过光阑后光束的偏振度和光强分布发生了显著的变化。横平面上偏振度出现了振荡 ,光强剖面为非均匀分布。

Based on the beam coherence polarization (BCP) matrix and the propagation law,the expressions for the degree of polarization and intensity distribution of nonuniformly polarized (NUP) beams through an aperture are derived. Numerical examples for a type of uniform intensity distribution NUP beams are given. It is shown that remarkable changes in both polarization and intensity distributions take place after the aperture. There are oscillations of the degree of polarization at the transversal plane and the intensity profile is nonuniform. However,the polarization becomes uniform in the far field.